Mathematics, 16.04.2020 04:16, joynerjaila
Last year, a study showed that the average ATM cash withdrawal took 65 seconds with a standard deviation of 10 seconds.
The study is to be repeated this year, but we need to determine the required sample size (n). Then, you will use a random sample from this year to construct a confidence interval for the average (mean) time it takes to withdraw cash from an ATM.
For the confidence level (1 - α) = 0.95, the critical value (CV) is
Select one:
a. 1.96
b. 1.64
c. 1.28
d. 2.58
How large a sample (rounded up) would be needed to estimate this year's mean with 95% confidence and a margin of error of 4 seconds? Use the standard deviation from last year study as the population standard deviation (σ).
Select one:
a. 25
b. 17
c. 11
d. 42
How large a sample (rounded up) would be needed to estimate this year's mean with a 95% confidence and a margin of error of 2 seconds? Use last year's standard deviation as the population standard deviation (σ).
Select one:
a. 97
b. 68
c. 41
d. 167
For the confidence level (1-α) = 0.99, the critical value (CV) is
Select one:
a. 2.58
b. 2.33
c. 1.28
d. 1.96
How large a sample (rounded up) would be needed to estimate this year's mean with a 99% confidence and a margin of error (ME) of 4 seconds? Use the standard deviation from last year as the population standard deviation (σ).
Select one:
a. 42
b. 34
c. 167
d. 97
Answers: 3
Mathematics, 21.06.2019 15:40, dmurdock1973
What is the probability of rolling a single die greater than 4
Answers: 1
Mathematics, 21.06.2019 22:00, 24lbriscoe
Astudent has created the give circuit diagram. it consists of a battery, a resistor, and a light bulb. in one minute, 1.2c of charge flows through the resistor. how much charge flows through the light bulb in one minute?
Answers: 1
Last year, a study showed that the average ATM cash withdrawal took 65 seconds with a standard devia...
History, 11.02.2021 14:00
Computers and Technology, 11.02.2021 14:00
Biology, 11.02.2021 14:00
Social Studies, 11.02.2021 14:00
Chemistry, 11.02.2021 14:00
Mathematics, 11.02.2021 14:00